Mojito sails the seas with a dream to find lost treasure. Mojito is a pure and kind fellow, although many humans are leery of getting close to him because of his appearance. 
He says he doesn't mind, but on the inside, it really gets him down. So to avoid getting hurt, he calls himself an evil dragon and puts up a fierce front toward strangers in order to actively keep them at a distance... but he still can't help being kind here or offering help there. As time went on, he became disingenuous!  